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62 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
.String galvanometer — A device used in photographic sound recording consisting of a conducting wire or ribbon in a strong magnetic field.
Substandard film — Film whose width is less than the normal 35 m/m.
Subtractive Process — Color processes in which various hues are obtained by the absorption in varying degree of one or more of the spectral regions comprising white light.
Synchronous Disc Attachment — A mechanism designed for attachment to standard projectors to permit running disc records in synchronism with pictures.
Take-up (noun) — The mechanism by means of which a film is wound upon a reel after it has passed through the projector, camera, printer, etc., mechanism.
Take-up (verb) — To wind up the film after it passes the picture aperture in motion picture apparatus.
Take-up Reel — The film reel which takes up the film after it has passed through the sound or picture reproducing or recording mechanism.
Threading-up — The operation of starting the film through the projector, camera, printer, etc.
Throw — See ''Projection Distance."
Tilt — To rotate a motion picture camera parallel to the direction of film motion and in a vertical plane through the optical axis.
Time-gamma Curve — ^A curve in which the value of gamma is plotted against the time of development.
Tinting — Coloring a film by dyeing the gelatine side of it.
Toe — The under exposure region of the characteristic curve. In this region, a linear relation does not exist between log 10 Exposure and density. Throughout this region the slope increases with increasing exposure.
Toning — Coloring a film by chemical action on the silver image.
Transmission Unit — See ''Bel."
Trick Crank — See "Single Picture Crank."
Trick Picture — A motion picture intended to give the effect of action other than that which really took place, or to give the impression that the action took place under circumstances other than those which actually prevailed.